The Humanics National Infant and Toddler Assessment Handbook is a checklist of skills and behaviors a child is likely to develop from birth to three years of age. Each item in the checklist is a sample of many related skills and behaviors and in that sense serves as an index of more general characteristics of development. Items are grouped into five scales that represent areas of child development: SocialEmotional, Language, and Cognitive, Gross and Fine motor Skills.